I got my wisdom tooth removed since it was impacted two months back. My jaw healed slowly there was a slight swelling  but since two days i have a small lump, painfull when i touch or smile on my jaw. I checked with my dentist. They took X rays and even checked the next two teeth said everything looks normal and the wound has healed also. For now they gave me zerodol mr and said they don't know the cause yet. Is this normal or should I be worried.